“Smart, thrilling, and utterly unnerving,” says Gillian Flynn, #1 bestselling author of Gone Girl, of this spellbinding tale that also has The New York Times Book Review declaring, “Bring on the devils.” Professor David Ullman teaches demonic literature at Columbia University, with special expertise in Milton’s Paradise Lost. The epic poem about Satan and his court of fallen angels makes for a fascinating lecture, but at the end of the day for David, it’s just another text, a classic work of fiction. So when a mysterious woman offers him a huge sum of money to travel to Venice and witness a demonic possession—and offer his professional opinion—he turns her down. Demons, he thinks, don’t really exist. But that night when David’s wife announces she’s leaving him and his life is suddenly in shambles, he changes his mind and impulsively whisks his beloved daughter Tess off to Italy for some R&R…and instead meets the ultimate horror. What happens in Venice will send the professor on an unimaginable journey from skeptic to true believer. Following symbols taken from the pages of Paradise Lost, and opening himself to the possibility that demons walk among us, David must rescue his daughter from one that has chosen him as its messenger, for reasons that will only be revealed when his journey is complete.